CN87100613A - Produce the soldering scaling powder of double coiled welded tube - Google Patents
Produce the soldering scaling powder of double coiled welded tube Download PDFInfo
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- CN87100613A CN87100613A CN 87100613 CN87100613A CN87100613A CN 87100613 A CN87100613 A CN 87100613A CN 87100613 CN87100613 CN 87100613 CN 87100613 A CN87100613 A CN 87100613A CN 87100613 A CN87100613 A CN 87100613A
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- scaling powder
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- welded tube
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Abstract
The invention provides a kind of scaling powder that is applicable to the soldering of double-deck copper facing volume welded tube.The chemical composition of this scaling powder comprises asphalt, graphite, carbon black and benzinum.The present invention is used for the soldering processes of double-deck copper facing volume welded tube as the welding auxiliary material, can not only improve the soldering processes performance, and can also improve the surface quality of volume welded tube outer wall.Advantages such as this scaling powder also has coating convenient, and is cheap.
Description
The invention belongs to the welding material.Mainly be applicable to the soldering of double-deck copper facing volume welded tube.
Double-deck copper facing volume welded tube is a kind of withstand voltage, antidetonation, anti-corrosion, and superior performance and the copper-plated two layer lead soldered composite steel tube of inside and outside wall with low cost.At present, be widely used in automobile brake system, fuel system and oil hydraulic system pipe both at home and abroad, and the condenser of refrigeration plant and evaporator tube etc.
Double coiled welded tube is with the copper-plated steel band in two sides, through rolling machine steel band is rolled into two-layer volume, and the garden pipe that the gap is very narrow, the steel pipe that is rolled into passes through soldering oven, wall copper plate with two-layer contact in reducing atmosphere melts, form 360 ° of all weld seams in full garden, in reducing atmosphere, cool off again subsequently, produce double-deck copper facing volume welded tube.
Usually, the steel pipe that is rolled into enters before the soldering oven, all uses a kind of special scaling powder (or claiming welding agent) topped firmly around its pipe crimping, improves the surface quality of coating etc.The concrete effect of this scaling powder has following three aspects:
1. during soldering, the copper of steel pipe surfaces externally and internally is unlikely to the outer wall slime flux;
2. impel and to keep brazing layer even, reduce bubble and leak weldering;
3. the subsides of control and elimination outer wall of steel pipe and soldering furnace wall are tied and are reduced friction.
In other words, this scaling powder can improve soldering processes, can improve the quality of steel tube surface layer again.When the scaling powder performance is not good, in brazing process, copper liquid will trickle to outer wall owing to the gravity effect, accumulate in the outer wall of pipe, form to drip the shape spot, be commonly called as sweating; Perhaps copper liquid flows out in soldering oven muffle tube wall and pastes knot formation accretion.This sweating and dross phenomenon not only make brazed copper run off, and cause Lou weldering, and make volume welded tube outer wall surface debase, subsequent process is handled caused difficulty, become waste product.
At present, it is a lot of to produce the producer of double coiled welded tube in the world.U.S. Pat-2720022, US-3156042 have introduced the manufacture method of double coiled welded tube.In the literature, in the time of narration double coiled welded tube technical process, all emphasize in brazing process, must use a kind of scaling powder (or welding agent), guarantee product quality.But the one-tenth of scaling powder is grouped into all not open.
The object of the present invention is to provide a kind of superior performance, can improve the soldering processes performance, can improve steel pipe coating surface quality and double-deck copper facing volume welded tube soldering scaling powder with low cost again.
Its solution mainly be according to the technological process of double-deck copper facing volume welded tube and soldering processes to the requirement of scaling powder, selects suitable scaling powder composition and proportioning thereof, in the hope of reaching the purpose of improving soldering processes performance and raising steel tube surface quality.
The MANUFACTURE OF DUAL-LAYER COILED WELDED PIPES technological process is as follows:
Two-sided copper facing low-carbon cold rolling steel band → slitting → pipe crimping moulding → soldering → tube reducing, alignment → flaw detection, check → finished product.
Scaling powder of the present invention is in the soldering operation when producing the volume welded tube, before pipe crimping enters soldering oven, to coat the scaling powder of pipe crimping outer wall in any way, normally carries out and improve the tube wall surface quality to guarantee soldering.
According to three your writings of above-described scaling powder with and to the requirement of scaling powder, scaling powder of the present invention is main component with asphalt, is auxiliary element with graphite, carbon ink, and adopts volatile benzinum as solvent.In the soldering oven preheating section, benzinum all volatilizees, in the asphalt volatile components also major part evaporate in the furnace gas; In the bringing-up section of soldering oven, the asphalt coking, and be melt into carbon membrane with graphite, carbon black, and on volume welded tube outer wall, increased the surface tension of outer wall molten copper liquid, impel copper liquid to interstitial diffusion, avoid sweating or dross phenomenon; Graphite also plays a part to reduce friction and is lubricated.
The composition proportion of the scaling powder that sets (percentage by weight) is as following table:
| Material name | Specification | Composition proportion (%) |
| Asphalt | Technical pure | 25～30 |
| Graphite powder | Technical pure, granularity is less than 350 orders | 2～5 |
| Carbon black | Technical pure, granularity is less than 600 orders | 0.2～0.5 |
| Benzinum | Technical pure, 60～90 ℃ of boiling points | 64.5～72.5 |
To place container by the compound of mentioned component and proportioning gained, and at room temperature mix, and be dissolved into dark solution, be scaling powder of the present invention.
Can adopt manual or mechanical coating method, scaling powder is applied to the pipe crimping outer wall of preparing soldering equably, enter in the soldering oven subsequently.Soldering oven is a continous way, and preheating section, bringing-up section and water jacket cooling section are arranged.Muffle tube is arranged in the stove, feed restitutive protection's gas (as hydrogen-nitrogen mixture gas) in the pipe.The temperature of soldering oven bringing-up section is 1100～1150 ℃, and pipe crimping by bringing-up section, after soldering is finished, enters the water jacket cooling section with 3～5 minutes speed, comes out of the stove be cooled to room temperature under protective atmosphere after.The function of scaling powder is in bringing-up section, and pitch coking is also formed the coking film with graphite, carbon black, attached to the outer wall of pipe crimping; At this moment, the copper layer has begun fusing, and copper liquid flows in pipe crimping inside and outside wall surface and pipe crimping gap.Because outer wall surface has the coking film topped, this place's copper liquid surface tension is increased, impel copper liquid to inside with to the trickling of pipe crimping gap, the assurance soldering is normally carried out; And prevented that volume welded tube wall and muffle tube from pasting knot.Graphite also plays and reduces volume welded tube and the effect that muffle tube rubs mutually in the coking film, prevents that the volume welded tube that traction caused of gripping roll is out of shape.Cooled volume welded tube outer wall is still preserved one deck graphite powdered carbon film, available manually the cleaning with water or the compressed air purge in back of coming out of the stove.
The scaling powder that is made into must be stored in the airtight container, in order to avoid the benzinum volatilization; Near the open flames prohibited container.
Adopt scaling powder of the present invention to carry out soldering, obtained good effect, reach the requirement of double-deck copper facing pipe crimping soldering fully.Following characteristics are specifically arranged:
1. improve the soldering processes performance, helped weldering effective;
2. volume welded tube tube wall is superior in quality after the soldering;
3. eliminated the excessive phenomenon of copper layer;
4. coating is convenient, cheap.
Embodiment one
Prepare scaling powder according to the composition proportion scope that sets, concrete composition proportion is: 70 kilograms of benzinums (technical pure), 25 kilograms in asphalt (technical pure), graphite (technical pure, granularity is less than 350 orders) 5 kilograms, 0.5 kilogram of carbon black (technical pure, granularity is less than 600 orders).
Asphalt is dissolved in the benzinum, and the filtering residue adds graphite, carbon black again, after mixing, promptly makes scaling powder (solution).With manual method scaling powder being applied diameter is on 8 millimeters the outer wall of double-deck copper-plated mild steel pipe crimping, and in soldering oven, carries out soldering under 1140 ℃ of temperature, obtains the double-deck copper facing mild steel volume welded tube of surface quality excellence after cooling off.
Embodiment two
With the 100 kilograms of asphalt (technical pure) that prepare, 15 kilograms of graphite (technical pures, granularity is less than 350 orders), 1 kilogram of carbon black (technical pure, granularity is less than 600 orders) in the container of packing into, heat and make asphalt soften into thick shape, after stirring, become to splash in the cold water with dripping, make granular solid matter, be stored in the container after drying.
During use, take out 30 kilograms of the granular solid matters prepare, and at room temperature be dissolved in 70 kilograms the benzinum, obtain stand-by scaling powder.With Ring form brush liquid scaling powder is coated on the double-deck copper-plated mild steel pipe crimping outer wall of 8 millimeters of φ, enters soldering oven subsequently, under 1140 ℃ of temperature, carry out soldering.Obtain the good volume welded tube product of surface quality after the cooling.
Claims (2)
1, a kind ofly is used for the scaling powder that the soldering of double-deck copper facing volume welded tube is used, it is characterized in that the chemical composition proportioning (percentage by weight) of scaling powder is: asphalt 25～30%, graphite powder 2～5%, carbon black 0.2～0.5%, benzinum 64.5～72.5%.
2, scaling powder according to claim 1 is characterized in that the specification of four kinds of raw materials is: the asphalt technical pure; The graphite powder technical pure, granularity＜350 orders; Carbon black industry is pure, granularity＜600 orders; 60～90 ℃ of benzinum technical pure boiling points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87100613A CN87100613B (en) | 1987-02-14 | 1987-02-14 | Solder flux for welding double-layer spiral pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87100613A CN87100613B (en) | 1987-02-14 | 1987-02-14 | Solder flux for welding double-layer spiral pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87100613A true CN87100613A (en) | 1987-10-21 |
| CN87100613B CN87100613B (en) | 1987-11-25 |
Family
ID=4812950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87100613A Expired CN87100613B (en) | 1987-02-14 | 1987-02-14 | Solder flux for welding double-layer spiral pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87100613B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949804A (en) * | 2014-05-04 | 2014-07-30 | 长沙威尔保新材料有限公司 | Brazing alloy for brazing ferrous metal materials and novel application of graphite powder |
| CN107775209A (en) * | 2016-08-30 | 2018-03-09 | 现代自动车株式会社 | The solder flux composition of carbonaceous component, the soft solder paste and soft soldering method for including it |
| CN110666398A (en) * | 2019-10-15 | 2020-01-10 | 西安石油大学 | Welding auxiliary active agent and novel nut projection welding method for improving welding penetration |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463770C (en) * | 2007-04-24 | 2009-02-25 | 西安兰方实业有限公司 | Process for producing double-layer wrapped welding tube used for connecting indoor/outdoor units of air conditioner |
-
1987
- 1987-02-14 CN CN87100613A patent/CN87100613B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949804A (en) * | 2014-05-04 | 2014-07-30 | 长沙威尔保新材料有限公司 | Brazing alloy for brazing ferrous metal materials and novel application of graphite powder |
| CN103949804B (en) * | 2014-05-04 | 2016-08-24 | 长沙威尔保新材料有限公司 | A kind of solder for ferrous material soldering |
| CN107775209A (en) * | 2016-08-30 | 2018-03-09 | 现代自动车株式会社 | The solder flux composition of carbonaceous component, the soft solder paste and soft soldering method for including it |
| CN107775209B (en) * | 2016-08-30 | 2020-12-01 | 现代自动车株式会社 | Flux composition containing carbon component, solder paste containing the same, and soldering method |
| CN110666398A (en) * | 2019-10-15 | 2020-01-10 | 西安石油大学 | Welding auxiliary active agent and novel nut projection welding method for improving welding penetration |
| CN110666398B (en) * | 2019-10-15 | 2021-07-16 | 西安石油大学 | Welding auxiliary active agent and projection welding method for improving welding penetration of nut |
Also Published As
| Publication number | Publication date |
|---|---|
| CN87100613B (en) | 1987-11-25 |
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